package com.torrenttunes.client.tools;

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class DesktopApi {

	static final Logger log = LoggerFactory.getLogger(DesktopApi.class);

	public static boolean browse(URI uri) {

		if (openSystemSpecific(uri.toString())) return true;

		if (browseDESKTOP(uri)) return true;

		return false;
	}


	public static boolean open(File file) {

		if (openSystemSpecific(file.getPath())) return true;

		if (openDESKTOP(file)) return true;

		return false;
	}


	public static boolean edit(File file) {

		// you can try something like
		// runCommand("gimp", "%s", file.getPath())
		// based on user preferences.

		if (openSystemSpecific(file.getPath())) return true;

		if (editDESKTOP(file)) return true;

		return false;
	}


	private static boolean openSystemSpecific(String what) {

		EnumOS os = getOs();

		if (os.isLinux()) {
			if (runCommand("kde-open", "%s", what)) return true;
			if (runCommand("gnome-open", "%s", what)) return true;
			if (runCommand("xdg-open", "%s", what)) return true;
		}

		if (os.isMac()) {
			if (runCommand("open", "%s", what)) return true;
		}

		if (os.isWindows()) {
			if (runCommand("explorer", "%s", what)) return true;
		}

		return false;
	}


	private static boolean browseDESKTOP(URI uri) {

		logOut("Trying to use Desktop.getDesktop().browse() with " + uri.toString());
		try {
			if (!Desktop.isDesktopSupported()) {
				logErr("Platform is not supported.");
				return false;
			}

			if (!Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
				logErr("BROWSE is not supported.");
				return false;
			}

			Desktop.getDesktop().browse(uri);

			return true;
		} catch (Throwable t) {
			logErr("Error using desktop browse.", t);
			return false;
		}
	}


	private static boolean openDESKTOP(File file) {

		logOut("Trying to use Desktop.getDesktop().open() with " + file.toString());
		try {
			if (!Desktop.isDesktopSupported()) {
				logErr("Platform is not supported.");
				return false;
			}

			if (!Desktop.getDesktop().isSupported(Desktop.Action.OPEN)) {
				logErr("OPEN is not supported.");
				return false;
			}

			Desktop.getDesktop().open(file);

			return true;
		} catch (Throwable t) {
			logErr("Error using desktop open.", t);
			return false;
		}
	}


	private static boolean editDESKTOP(File file) {

		logOut("Trying to use Desktop.getDesktop().edit() with " + file);
		try {
			if (!Desktop.isDesktopSupported()) {
				logErr("Platform is not supported.");
				return false;
			}

			if (!Desktop.getDesktop().isSupported(Desktop.Action.EDIT)) {
				logErr("EDIT is not supported.");
				return false;
			}

			Desktop.getDesktop().edit(file);

			return true;
		} catch (Throwable t) {
			logErr("Error using desktop edit.", t);
			return false;
		}
	}


	private static boolean runCommand(String command, String args, String file) {

		logOut("Trying to exec:\n   cmd = " + command + "\n   args = " + args + "\n   %s = " + file);

		String[] parts = prepareCommand(command, args, file);

		try {
			Process p = Runtime.getRuntime().exec(parts);
			if (p == null) return false;

			try {
				int retval = p.exitValue();
				if (retval == 0) {
					logErr("Process ended immediately.");
					return false;
				} else {
					logErr("Process crashed.");
					return false;
				}
			} catch (IllegalThreadStateException itse) {
				logErr("Process is running.");
				return true;
			}
		} catch (IOException e) {
			logErr("Error running command.", e);
			return false;
		}
	}


	private static String[] prepareCommand(String command, String args, String file) {

		List<String> parts = new ArrayList<String>();
		parts.add(command);

		if (args != null) {
			for (String s : args.split(" ")) {
				s = String.format(s, file); // put in the filename thing

				parts.add(s.trim());
			}
		}

		return parts.toArray(new String[parts.size()]);
	}

	private static void logErr(String msg, Throwable t) {
		log.error(msg);
	}

	private static void logErr(String msg) {
		log.error(msg);    }

	private static void logOut(String msg) {
		log.debug(msg);
	}

	public static enum EnumOS {
		linux, macos, solaris, unknown, windows;

		public boolean isLinux() {

			return this == linux || this == solaris;
		}


		public boolean isMac() {

			return this == macos;
		}


		public boolean isWindows() {

			return this == windows;
		}
	}


	public static EnumOS getOs() {

		String s = System.getProperty("os.name").toLowerCase();

		if (s.contains("win")) {
			return EnumOS.windows;
		}

		if (s.contains("mac")) {
			return EnumOS.macos;
		}

		if (s.contains("solaris")) {
			return EnumOS.solaris;
		}

		if (s.contains("sunos")) {
			return EnumOS.solaris;
		}

		if (s.contains("linux")) {
			return EnumOS.linux;
		}

		if (s.contains("unix")) {
			return EnumOS.linux;
		} else {
			return EnumOS.unknown;
		}
	}
}